Answer:
The probability is:

Explanation:
It is given that:
Erin has four shirts (white, blue, red, black)
and two pairs of pants (blue and black).
Let W denote white
B' denote Blue
R denote red
and B denote Black color.
This means that the pair that can be made with the help of the four shirts and 2 pants are:
{WB',WB,B'B',B'B,RB',RB,BB',BB}
Total number of combinations possible=8.
The number of combinations that or same color are: 2
( since BB,B'B' are the two combinations)
Hence,the probability that they are the same color is:

Hence, the probability is:
